Question

question 9 (multiple choice worth 4 points)
(06.04 mc)

some steps in cell division are shown below:

1. chromosomes condense and pair up
2. segments of dna of sister chromatids twist and cross
3. exchange of dna occurs between chromosomes
4. four daughter cells are created that are haploid

which of the following steps is least likely to occur during meiosis 1?

step 1
step 2
step 3
step 4

Explanation:

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<reasoning>

Analyze meiosis I events

Using the Meiosis Stages knowledge point

• Step 1 (Chromosomes condense and pair up) describes prophase I, where homologous chromosomes pair to form tetrads.
• Step 2 (Segments of DNA of sister chromatids twist and cross) and Step 3 (Exchange of DNA occurs between chromosomes) describe crossing over, which occurs during prophase I of meiosis I.

Analyze meiosis II and cytokinesis

Using the Haploid and Diploid and Meiosis Stages knowledge points

• Step 4 (Four daughter cells are created that are haploid) is the final outcome of the entire meiotic process, which is completed only at the end of meiosis II.
• Meiosis I ends with the formation of two haploid daughter cells, not four. Therefore, Step 4 is least likely to occur during meiosis I.

</reasoning>

<answer>
<mcq-option>Step 1</mcq-option>
<mcq-option>Step 2</mcq-option>
<mcq-option>Step 3</mcq-option>
<mcq-correct>Step 4</mcq-correct>
</answer>

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Answer:

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<reasoning>

Analyze meiosis I events

Using the Meiosis Stages knowledge point

• Step 1 (Chromosomes condense and pair up) describes prophase I, where homologous chromosomes pair to form tetrads.
• Step 2 (Segments of DNA of sister chromatids twist and cross) and Step 3 (Exchange of DNA occurs between chromosomes) describe crossing over, which occurs during prophase I of meiosis I.

Analyze meiosis II and cytokinesis

Using the Haploid and Diploid and Meiosis Stages knowledge points

• Step 4 (Four daughter cells are created that are haploid) is the final outcome of the entire meiotic process, which is completed only at the end of meiosis II.
• Meiosis I ends with the formation of two haploid daughter cells, not four. Therefore, Step 4 is least likely to occur during meiosis I.

</reasoning>

<answer>
<mcq-option>Step 1</mcq-option>
<mcq-option>Step 2</mcq-option>
<mcq-option>Step 3</mcq-option>
<mcq-correct>Step 4</mcq-correct>
</answer>

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